1.

There is a straight wire suspended in magnetic field and there is a ring made out from the wire of same length also, suspended in same magnetic field. When both are made to oscillate like pendulum inside a magnetic field then which one will stop earlier?

Answer»

SOLUTION :In case of ring induced CURRENT can flow and cause loss of energy DUE to electric heating, so ring will stop oscillating earlier than rod. In case of rod emf MAY induce but due to absence of closed loop there would not be any current and so it will stop only when the rod loses complete MECHANICAL energy against air resistance, so it will take more time to stop.


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